Ok, had a chance to take it out and ride it after doing the "normal" mods. I still stand by my first thinking, with just changing the throttle stop, I think the bike runs fine and feel like I could race it in the A enduro class and the power wouldn't be a factor in how I placed. But ... one person made a great point that having a bike too lean makes it run hotter and not last as long. So I did the normal stuff: - bought the Yamaha AIS removal kit - left the AIS on (in CA) - changed all the jets in the kit - added a remote fuel/air screw - pulled out the airbox snorkle - pulled out the pea shooter thing in the pipe (the smallest insert) - disconnected the gray wire - put in the shorter throttle stop screw And the results? Runs great, not a monster, and actually, I don't notice a huge difference. Certainly the throttle stop change is a huge difference, but the power characteristics seems the same. Maybe a bit quicker reving, more "lively", but nothing that drastic. But now I gotta focus on the suspension ... that needs a bunch of work. Usetobefast, I just bought the 09' wr450f. Completely stock. Can I get away with just doing throttle stop screw, pea shooter, and gray wire mod? In your opinion... I live in Pittsburgh, PA.